package com.itheima.test;

import com.itheima.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManager {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        ArrayList<Student> list = new ArrayList<Student>();
        ol: while (true){
            System.out.println("-----------欢迎来到学生管理系统-----------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择");

            String choice = sc.next();

             switch(choice){
                case"1":
                    //System.out.println("添加学生");
                    addStudent(list);
                    break;
                case"2":
                    //System.out.println("删除学生");
                    deleteStudent(list);
                    break;
                case"3":
                   // System.out.println("修改学生");
                    updateStudent(list);
                    break;
                case"4":
                   // System.out.println("查看学生");
                    queryStudent(list);
                    break;
                case"5":
                    System.out.println("感谢使用!");
                    break ol;
                default:
                    System.out.println("输入有误");
            }
        }

    }

    private static void updateStudent(ArrayList<Student> list) {
        //提示你要修改的学生学号
        System.out.println("请输入您要修改的学号");
        //键盘录入接收
        Scanner sc = new Scanner(System.in);
        String updateSid = sc.next();
        //调用getIndex方法,查找该学生在集合中出现的索引位置
        int index = getIndex(list,updateSid);
        if(index == -1){
            System.out.println("查无信息,请重新输入");
        }else{
            //键盘录入要修改的信息
            System.out.println("请输入新的学生姓名");
            String name = sc.next();
            System.out.println("请输入新的学生年龄");
            String age = sc.next();
            System.out.println("请输入新的学生生日");
            String birthday = sc.next();

            Student stu = new Student(updateSid,name ,age,birthday);
            list.set(index,stu);
            System.out.println("修改成功!");
        }

    }

    private static void deleteStudent(ArrayList<Student> list) {
        //给出信息提示(请输入您要删除的学号)
        System.out.println("请输入您要删除的学号:");
        //键盘接受要删除的学号
        Scanner sc = new Scanner(System.in);
        String deleteSid = sc.next();
        //调用getIndex方法,查找该学生在集合中出现的索引位置
        int index = getIndex(list,deleteSid);
        if(index == -1){
            //不存在给出提示
            System.out.println("查无信息,请重新输入");
        }else {
            //删除
            list.remove(index);
            System.out.println("删除成功");
        }
    }

    private static void queryStudent(ArrayList<Student> list) {
        if(list.size() == 0){
            System.out.println("无信息,请添加后查询");
            return;
        }
        System.out.println("学号\t\t\t姓名\t\t年龄\t\t生日");

        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            System.out.println(stu.getSid() + "\t" + stu.getName() + "\t\t" + stu.getAge() + "\t\t" + stu.getBirthady());
        }
    }

    public static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        String sid;
        while(true){
            System.out.println("请输入学号");
             sid = sc.next();
            int index = getIndex(list,sid);
             if(index == -1){
                 break;
             }
            System.out.println("学号已存在,请重新输入");
        }



        System.out.println("请输入姓名");
        String name = sc.next();
        System.out.println("请输入年龄");
        String age = sc.next();
        System.out.println("请输入生日");
        String birthday = sc.next();

        Student stu = new Student(sid,name,age,birthday);

        list.add(stu);

        System.out.println("添加成功");
    }

    public static int getIndex(ArrayList<Student> list,String sid){
        //假设学号不存在
        int index = -1;
        //遍历几个,获取每一个学生对象,准备查找
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            //获取每个学生对象的学号
            String id = stu.getSid();
            //使用取出的学生好,和传入的学号进行对比
            if(id.equals(sid)){
                //存在:让index变量记录正确的索引位置
                index = i;
                break;
            }
        }
        //返回index
        return index;
    }
}
